Preparation and Properties of Biodegradable Nano-CaCO3/BF/PHA/PE Composites
In this study,polyethylene(PE)was used as the raw material,and polyhydroxyalkanoate(PHA),modified nano-CaCO3 and bagasse fiber(BF)were used as the composite fillers,and the nano-CaCO3/BF/PHA/PE composites were prepared by melt extrusion and injection molding.The effects of the optimal ratios of PHA,modified nano-CaCO3 and BF and their contents on the internal structure and properties of the composites were investigated by mechanical property tests,Fourier transform infrared spectroscopy(FTIR)analysis,thermogravimetric(TG)analysis,scanning electron microscopy(SEM)and other characterization methods.The results show that with 5% PHA,5% BF,and 5% nano-CaCO3,the mechanical properties of the composites were optimal at 12.9 MPa,and the maximum thermal decomposition temperature of the nano-CaCO3/BF/PHA/PE composites reached 437℃at this ratio,which was higher than the thermal decomposition temperature(453℃)of the composites before modification.The study provides ideas for the green development of degradable polymer materials.
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